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Agarwal H, Roy E, Singh N, Klusener PA, Stephens RM, Zhou QT. Electrode Treatments for Redox Flow Batteries: Translating Our Understanding from Vanadium to Aqueous-Organic. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2307209. [PMID: 37973559 PMCID: PMC10767411 DOI: 10.1002/advs.202307209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Indexed: 11/19/2023]
Abstract
Redox flow batteries (RFBs) are a promising technology for long-duration energy storage; but they suffer from inefficiencies in part due to the overvoltages at the electrode surface. In this work, more than 70 electrode treatments are reviewed that are previously shown to reduce the overvoltages and improve performance for vanadium RFBs (VRFBs), the most commercialized RFB technology. However, identifying treatments that improve performance the most and whether they are industrially implementable is challenging. This study attempts to address this challenge by comparing treatments under similar operating conditions and accounting for the treatment process complexity. The different treatments are compared at laboratory and industrial scale based on criteria for VRFB performance, treatment stability, economic feasibility, and ease of industrial implementation. Thermal, plasma, electrochemical oxidation, CO2 treatments, as well as Bi, Ag, and Cu catalysts loaded on electrodes are identified as the most promising for adoption in large scale VRFBs. The similarity in electrode treatments for aqueous-organic RFBs (AORFBs) and VRFBs is also identified. The need of standardization in RFBs testing along with fundamental studies to understand charge transfer reactions in redox active species used in RFBs moving forward is emphasized.
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Affiliation(s)
- Harsh Agarwal
- Department of Chemical Engineering and Catalysis Science and Technology InstituteUniversity of Michigan Ann ArborAnn ArborMI48109‐2136USA
- Shell International Exploration and Production Inc.3333 Highway 6 SouthHoustonTX77082USA
| | - Esha Roy
- Shell Global Solutions International B.V. Energy Transition Campus AmsterdamGrasweg 31Amsterdam1031 HWThe Netherlands
| | - Nirala Singh
- Department of Chemical Engineering and Catalysis Science and Technology InstituteUniversity of Michigan Ann ArborAnn ArborMI48109‐2136USA
| | - Peter A.A. Klusener
- Shell Global Solutions International B.V. Energy Transition Campus AmsterdamGrasweg 31Amsterdam1031 HWThe Netherlands
| | - Ryan M. Stephens
- Shell International Exploration and Production Inc.3333 Highway 6 SouthHoustonTX77082USA
| | - Qin Tracy Zhou
- Shell International Exploration and Production Inc.3333 Highway 6 SouthHoustonTX77082USA
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Chen W, Zhang LL, Wei Z, Zhang MK, Cai J, Chen YX. The electrostatic effect and its role in promoting electrocatalytic reactions by specifically adsorbed anions. Phys Chem Chem Phys 2023; 25:8317-8330. [PMID: 36892566 DOI: 10.1039/d2cp04547h] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The adsorption of anions and its impact on electrocatalytic reactions are fundamental topics in electrocatalysis. Previous studies revealed that adsorbed anions display an overall poisoning effect in most cases. However, for a few reactions such as the hydrogen evolution reaction (HER), oxidation of small organic molecules (SOMs), and reduction of CO2 and O2, some specifically adsorbed anions can promote their reaction kinetics under certain conditions. The promotion effect is frequently attributed to the adsorbate induced modification of the nature of the active sites, the change of the adsorption configuration and free energy of the key reactive intermediate which consequently change the activation energy, the pre-exponential factor of the rate determining step etc. In this paper, we will give a mini review of the indispensable role of the classical double layer effect in enhancing the kinetics of electrocatalytic reactions by anion adsorption. The ubiquitous electrostatic interactions change both the potential distribution and the concentration distribution of ionic species across the electric double layer (EDL), which alters the electrochemical driving force and effective concentration of the reactants. The contribution to the overall kinetics is highlighted by taking HER, oxidation of SOMs, reduction of CO2 and O2, as examples.
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Affiliation(s)
- Wei Chen
- Hefei National Research Center for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| | - Lu-Lu Zhang
- Hefei National Research Center for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| | - Zhen Wei
- Hefei National Research Center for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| | - Meng-Ke Zhang
- Hefei National Research Center for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| | - Jun Cai
- Hefei National Research Center for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| | - Yan-Xia Chen
- Hefei National Research Center for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
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Agarwal H, Florian J, Pert D, Goldsmith BR, Singh N. Explaining Kinetic Trends of Inner-Sphere Transition-Metal-Ion Redox Reactions on Metal Electrodes. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Harsh Agarwal
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan48109-2136, United States
- Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan48109-2136, United States
| | - Jacob Florian
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan48109-2136, United States
- Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan48109-2136, United States
| | - Daniel Pert
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan48109-2136, United States
- Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan48109-2136, United States
| | - Bryan R. Goldsmith
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan48109-2136, United States
- Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan48109-2136, United States
| | - Nirala Singh
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan48109-2136, United States
- Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan48109-2136, United States
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Ghosh S, Agarwal H, Galib M, Tran B, Balasubramanian M, Singh N, Fulton JL, Govind N. Near-Quantitative Predictions of the First-Shell Coordination Structure of Hydrated First-Row Transition Metal Ions Using K-Edge X-ray Absorption Near-Edge Spectroscopy. J Phys Chem Lett 2022; 13:6323-6330. [PMID: 35793526 DOI: 10.1021/acs.jpclett.2c01532] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The solvation structure of transition metal ions is important for applications in geochemistry, biochemistry, energy storage, and environmental chemistry. We study the X-ray absorption pre-edge and near-edge spectra at the K-edge of a nearly complete series of hydrated first-row transition metal ions with d orbital occupancy from d2 to d10. We optimize all of the structures at the density functional theory (DFT) level with explicit solvation and then compute the pre-edge X-ray absorption spectra with time-dependent DFT (TDDFT) and restricted active space second-order perturbation theory (RASPT2). TDDFT provides accurate results for spectra that are dominated by single excitations, while RASPT2 correctly distinguishes between singly and doubly excited states with quantitative accuracy compared with experiment. We analyze the pre-edge features for each metal ion to reveal the impact of the variations in d orbital occupancy on the first-shell coordination environment. We also report the lowest-energy ligand field d-d transitions using complete active space second-order perturbation theory.
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Affiliation(s)
- Soumen Ghosh
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Harsh Agarwal
- Department of Chemical Engineering and Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Mirza Galib
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Ba Tran
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | | | - Nirala Singh
- Department of Chemical Engineering and Catalysis Science and Technology Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - John L Fulton
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Niranjan Govind
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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